EP1136716A1 - Procédé de reconnaissance d'un état de débrayage dans un embrayage - Google Patents

Procédé de reconnaissance d'un état de débrayage dans un embrayage Download PDF

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Publication number
EP1136716A1
EP1136716A1 EP01106758A EP01106758A EP1136716A1 EP 1136716 A1 EP1136716 A1 EP 1136716A1 EP 01106758 A EP01106758 A EP 01106758A EP 01106758 A EP01106758 A EP 01106758A EP 1136716 A1 EP1136716 A1 EP 1136716A1
Authority
EP
European Patent Office
Prior art keywords
engine speed
declutch
transition
open
throttle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01106758A
Other languages
German (de)
English (en)
Other versions
EP1136716B1 (fr
Inventor
Bart Schreurs
Michel Peters
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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Filing date
Publication date
Application filed by Delphi Technologies Inc filed Critical Delphi Technologies Inc
Publication of EP1136716A1 publication Critical patent/EP1136716A1/fr
Application granted granted Critical
Publication of EP1136716B1 publication Critical patent/EP1136716B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/02—Cutting-out
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/10—System to be controlled
    • F16D2500/104—Clutch
    • F16D2500/10406—Clutch position
    • F16D2500/10412—Transmission line of a vehicle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/304—Signal inputs from the clutch
    • F16D2500/30401—On-off signal indicating the engage or disengaged position of the clutch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/306—Signal inputs from the engine
    • F16D2500/3061—Engine inlet air flow rate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/306—Signal inputs from the engine
    • F16D2500/3067—Speed of the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/308—Signal inputs from the transmission
    • F16D2500/30806—Engaged transmission ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/31—Signal inputs from the vehicle
    • F16D2500/3108—Vehicle speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/314—Signal inputs from the user
    • F16D2500/31406—Signal inputs from the user input from pedals
    • F16D2500/3144—Accelerator pedal position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/316—Other signal inputs not covered by the groups above
    • F16D2500/3166—Detection of an elapsed period of time
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/70—Details about the implementation of the control system
    • F16D2500/706—Strategy of control
    • F16D2500/70605—Adaptive correction; Modifying control system parameters, e.g. gains, constants, look-up tables

Definitions

  • the present invention generally relates to a method for detecting the occurrence of a declutch of an internal combustion engine coupled to a clutch and a method for controlling an internal combustion engine.
  • the object of the present invention is to propose a simple and efficient method for detecting the occurrence of a declutch. This object is achieved by a method as claimed in claim 1.
  • a method in accordance with the invention concerns the detection of the occurrence of a declutch of an internal combustion engine coupled to a clutch and having a throttle valve for controlling intake air flow.
  • the method comprises the steps of:
  • the expected engine response is a decrease in engine speed.
  • the clutch pedal is depressed, the engine speed has a tendency to increase.
  • an increase in engine speed after a transition from open to closed throttle is a reliable criterion for detecting the occurrence of a declutch.
  • the method can be easily implemented as it uses conventional parameters.
  • transition from open to closed throttle means the transition from any open position of the throttle to the idle speed throttle position. In other words, if a transition to closed throttle position occurs, the throttle does not necessarily be fully closed.
  • the occurrence of a declutch is only determined if the increase of the engine speed exceeds a predetermined delta engine speed threshold.
  • the declutch is only detected, if the engine speed increases by a predetermined value above the engine speed at the transition from open to closed throttle. Hence the conclusion of the occurrence of a declutch on the basis of a parasitic increase in engine speed can be avoided.
  • the drivetrain which is connected to the clutch, can be excited because of an abrupt engine torque change.
  • these oscillations cause engine speed fluctuations, also in the form of gear dependent oscillations. Therefore, to prevent the erroneous detection of a declutch, the monitoring of the engine speed is preferably only started after a delay period following said transition from open to closed throttle.
  • the monitoring of engine speed is preferably carried out during a limited time, called monitoring period, after a transition from open to closed throttle. This is to prevent the erroneous detection of a declutch when the throttle is closed driving downhill, thus causing an increase in engine speed over a certain time period depending on the gear.
  • the delay period, the monitoring period, and/or the delta engine speed threshold are defined for each gear.
  • the method is optimized in function of the gear, and permits an error free detection of a declutch.
  • the engine speed is monitored during a gear dependent time window after the transition from open to closed throttle, starting after said delay period.
  • the time window is defined so as to coincide temporally with the first valley of engine speed oscillations that would be caused by a let-off without a declutch. This permits to select a time interval during which, if no declutch is performed, the engine speed reaches a minimum. Hence, if an increase in engine speed is monitored during this time window, it can without any doubt be concluded to the occurrence of a declutch.
  • the transition from open to closed throttle can easily be determined by a sensor associated to the throttle valve. However, this transition may also be determined on the basis of the position of the accelerator pedal. A let-off can thereby be used in the present method as an indication of a transition from open to closed throttle.
  • a method for generating a signal indicating a declutch of an internal combustion engine coupled to a clutch, the engine having a throttle valve for controlling intake air flow.
  • the method comprises the steps of:
  • Such a method may be advantageously implemented on electronic engine controls where the indication of a declutch is needed as a condition in different procedures. It will be understood that the above described embodiments and preferences can be adapted to this method for generating a signal indicating a declutch.
  • a method for controlling an internal combustion engine coupled to a clutch comprising a fuel supply and a throttle valve for controlling intake air flow. This method comprises the steps of:
  • the fuel supply is preferably shut-off until the engine speed has decreased to a predetermined engine speed threshold value, e.g. the desired idle speed plus a calibratable offset, or until a transition from closed to open throttle has occurred, i.e. when the accelerator pedal is depressed.
  • a predetermined engine speed threshold value e.g. the desired idle speed plus a calibratable offset
  • the fuel supply is advantageously shut-off only if the speed of the vehicle driven by said internal combustion engine is higher than a predetermined vehicle speed threshold value.
  • said fuel supply is preferably shut-off until the engine speed has decreased to a predetermined threshold value or until a transition from closed to open throttle has occurred or until the speed of the vehicle has decreased to a value below said predetermined vehicle speed threshold value.
  • Fig. 1 shows a flowchart of a preferred embodiment of a method of detecting a declutch respectively a gear shift according to the present invention. This method is used in a vehicle each time that the accelerator pedal is released, i.e. at each transition from open to closed throttle.
  • a first (gear dependent) timer is decremented (shown at 14), the expiration of which sets the beginning of the detection time window.
  • the first timer is preferably calibrated so as to expire at a moment at which the engine speed would decrease due to the above described drive train oscillations in the case of a let-off without declutch. Accordingly the monitoring of the engine speed is only started after a delay period following said transition from open to closed throttle.
  • a second gear dependent timer is decremented at 16, the expiration of which sets the end of the detecting time window.
  • the time window which is defined between the expiration of the timers is also gear dependent.
  • the time window is defined so as to coincide temporally with the first valley of engine speed oscillations that would be caused by a let-off without a declutch. This permits to select a time interval during which, if no declutch is performed, the engine speed reaches a minimum.
  • the gear shift detection method is enabled. Further conditions for the gear shift detection to be enabled may be set. For instance the engine speed should be higher than a minimum threshold speed value, below which a gear shift is not likely (see test at 22). Furthermore normal deceleration fuel shut off should not be enabled (test at 24) in order not to interfere with the corresponding algorithm. If one of these conditions is not met, the gear shift detecting method is disabled 26.
  • the difference of the current engine speed and the engine speed at the moment of the pedal let-off is computed (28) and the so calculated difference is compared (30) to a gear dependent delta engine speed threshold value, which is indicative of the engine speed increase in case of a declutch.
  • a gear dependent delta engine speed threshold value which is indicative of the engine speed increase in case of a declutch.
  • the gear shift detected flag is cleared (34) and all the parameters of the method are reset.
  • the current engine speed is constantly memorized to be used in the next loop of the algorithm as the engine speed at the moment of the transition from open to closed throttle 36.
  • the first and second timers and the delta engine speed threshold value are initialized depending on the current gear 38.
  • Fig.2 shows a flow chart of a method for controlling an internal combustion engine using the method of detection of a gear shift of Fig.1. If a gear shift is detected (at 40) and the fuel shut off is not already enabled, the fuel is shut off to all the cylinders 42 if the vehicle speed is higher than the above described vehicle speed threshold value 44. It follows that the fuel shut off is now enabled.
  • the engine speed is then monitored 46 in order to detect the moment when the engine speed starts to decrease. Once the engine speed decreases, a fuel shut off disable threshold is set as the desired idle speed plus a calibratable offset 48. Once the engine speed has decreased to a value below this fuel shut off disable threshold (50), the fuel shut off is disabled again and fuel is supplied to all cylinders 52.
  • fuel shut off is also disabled if the accelerator is depressed 54 or if the vehicle speed decreases below the vehicle speed threshold value 56.
  • Figures 3 and 4 illustrate the normal behavior of the engine speed in case of a transition from open to closed throttle (at 58) without declutch respectively followed by a declutch.
  • the engine speed increases due to the large amount of air present in the manifold and the sudden decrease in the load on the engine.
  • the resulting engine speed flare is represented in fig.4. If the let off is not followed by a declutch, the engine speed performs oscillations which dampen out with time. These oscillations are due to the drivetrain oscillations and accordingly the frequency and the amplitude of these oscillations are dependent on the gear. This case is illustrated in fig. 3.
  • the drive train oscillations thus cause the engine speed to increase immediately after the transition from open to closed throttle. It follows that the monitoring of the engine speed immediately after the transition could lead to erroneous gear shift detection.
  • the method according to the present invention proposes to preferably monitor the engine speed only during a gear dependent time window 60, which is defined so as to coincide temporally with the first valley of engine speed oscillations that would be caused by a let-off without a declutch (see fig. 3). If during this time window 60, the engine speed increases to a value above the gear dependent delta engine speed threshold value, one can without any doubt conclude to the occurrence of a declutch. Hence the fuel supply to the cylinders can be shut off and the speed flare shown in fig. 4 can be avoided.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP01106758A 2000-03-24 2001-03-17 Procédé de reconnaissance d'un état de débrayage dans un embrayage Expired - Lifetime EP1136716B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU90556 2000-03-24
LU90556A LU90556B1 (en) 2000-03-24 2000-03-24 A method for detecting the occurrence of a declutch

Publications (2)

Publication Number Publication Date
EP1136716A1 true EP1136716A1 (fr) 2001-09-26
EP1136716B1 EP1136716B1 (fr) 2008-05-14

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ID=19731883

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01106758A Expired - Lifetime EP1136716B1 (fr) 2000-03-24 2001-03-17 Procédé de reconnaissance d'un état de débrayage dans un embrayage

Country Status (3)

Country Link
EP (1) EP1136716B1 (fr)
DE (1) DE60133963D1 (fr)
LU (1) LU90556B1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4632231A (en) * 1983-06-30 1986-12-30 Isuzu Motors Limited Method of controlling the starting of a vehicle having automatic clutch
DE3809118A1 (de) * 1987-03-26 1988-10-13 Zahnradfabrik Friedrichshafen Einrichtung zur steuerung einer automatischen kraftfahrzeugkupplung
EP0390423A1 (fr) * 1989-03-27 1990-10-03 Diesel Kiki Co. Ltd. Méthode pour commander un moteur à combustion interne pour véhicule avec système de transmission automatique
EP0423799A2 (fr) * 1989-10-19 1991-04-24 Toyota Jidosha Kabushiki Kaisha Dispositif de commande d'une transmission semi-automatique de véhicule incluant des moyens pour empêcher un débrayage complet d'un embrayage automatique pour empêcher le moteur de passer en survitesse
FR2682649A1 (fr) * 1991-10-19 1993-04-23 Fichtel & Sachs Ag Dispositif destine a detecter la position du debut de la transmission du couple de rotation d'un embrayage de vehicule automobile.
EP0627336A2 (fr) * 1993-06-03 1994-12-07 Aisin Aw Co., Ltd. Système de commande à changement de vitesse pour une transmission automatique
EP0697302A2 (fr) * 1994-08-19 1996-02-21 Eaton Corporation Logique retrogradée pour boîte de vitesses mécanisme semi-automatique avec activité manuelle d'embrayage
DE19538308A1 (de) * 1994-10-27 1996-05-02 Volkswagen Ag Verfahren zur Steuerung der Drehzahl einer Brennkraftmaschine während eines Schaltvorganges eines Schaltgetriebes

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4632231A (en) * 1983-06-30 1986-12-30 Isuzu Motors Limited Method of controlling the starting of a vehicle having automatic clutch
DE3809118A1 (de) * 1987-03-26 1988-10-13 Zahnradfabrik Friedrichshafen Einrichtung zur steuerung einer automatischen kraftfahrzeugkupplung
EP0390423A1 (fr) * 1989-03-27 1990-10-03 Diesel Kiki Co. Ltd. Méthode pour commander un moteur à combustion interne pour véhicule avec système de transmission automatique
EP0423799A2 (fr) * 1989-10-19 1991-04-24 Toyota Jidosha Kabushiki Kaisha Dispositif de commande d'une transmission semi-automatique de véhicule incluant des moyens pour empêcher un débrayage complet d'un embrayage automatique pour empêcher le moteur de passer en survitesse
FR2682649A1 (fr) * 1991-10-19 1993-04-23 Fichtel & Sachs Ag Dispositif destine a detecter la position du debut de la transmission du couple de rotation d'un embrayage de vehicule automobile.
EP0627336A2 (fr) * 1993-06-03 1994-12-07 Aisin Aw Co., Ltd. Système de commande à changement de vitesse pour une transmission automatique
EP0697302A2 (fr) * 1994-08-19 1996-02-21 Eaton Corporation Logique retrogradée pour boîte de vitesses mécanisme semi-automatique avec activité manuelle d'embrayage
DE19538308A1 (de) * 1994-10-27 1996-05-02 Volkswagen Ag Verfahren zur Steuerung der Drehzahl einer Brennkraftmaschine während eines Schaltvorganges eines Schaltgetriebes

Also Published As

Publication number Publication date
EP1136716B1 (fr) 2008-05-14
LU90556B1 (en) 2001-09-25
DE60133963D1 (de) 2008-06-26

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